pmudb FOREIGN TECHNOLOGY DIVISION Approvdforpubli relase FTD-MT? THE VISCOSITY OF ISOBUTANE AT HIGH PRESSURES 2 - by

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1 FTD-MT? FOREIGN TECHNOLOGY DIVISION 144 THE VISCOSITY OF ISOBUTANE AT HIGH PRESSURES 2 - by N. A. Agayev and A. D. Yusibova Ii Approvdforpubli relase distribution unlimited. Ii pmudb

2 secut C0agaificatI.. (SewI~t48C~f~eA*I*I.. DOCMANT CON1TROL DATA It & D I. ~~ti l.ied (Setwily~~~~ ~ ~ ~ ~ ~ el00181"ofttl.be f e sdeieh.&sfs meet be.u~wedwhe *,.esiteot$ lasfid i.. S&E0PORT SECURITY CLASSIFICATION Foreign Technology Division IUACLASSIFIED Air Force Systems CommandA6GRU ** U. S. Air Force I.'ORIGINAIINS ACTIVITY (COmu. "ari~) THE VISCO SITY OF ISOBITANE AT HIGH PRESSURES 4. OCECRIPTIvE NOTES ("~ *f1g ~tavid iev. delta) Translation 18 AU T440R118 (PIlN OWO, aud*# Sa10601,.#Set l"nws) Agayev, N. A. and Yusibova, A. D. 4. REPORT DATE 70. TOTAL NO. GP PAGES 76. NO. or Ret$ March PROJECT NO. F-36:15-71-c-1182 ' (71 Jan 01) FTD-Mtr-2 1 { OISTRINUTION STATEMENTj Approved for public release; distribution unlimited. II. SUPPLEMENTARY NOTES ASSTRACT IWright-Patterson T1a. SPONSORING MILITARY ACTIVITY Foreign Technology DivisionJ AFB, Ohioj In literature there is a series of works devoted to the study of the viscosity of liquid and gaseous isobutane. The cornparison of experimental findings given in these works showed that they differed from one another substantially, therefore a study was made of the viscosity of liquid and gaseous isobutane (including the line of saturation aind the area close to the critical point) in the interval of pressures from I. to 700 k~cwsp cipt 2) and temperatures of degrees C. DD sm

3 *1 FTD-MT EDITED MACHINE TRANSLATION THE VISCOSITY OF ISOBUTANE AT HIGH PRESSURES By: N. A. Agayev and A. D. Yusibova English pages: 5 Source: Gazovaya Promyshlennost2 Industry), Vol. 14, No. 3, 169, pp This document is a SYSTRAN machine aided translation, post-edited for technical accuracy by: Charles T. Ostertag. UR/ Approved for public release; distribution unlimited. t THIS TRANSLATION IS A RENDITION OF THE ORIGI. NAL FOREIGN TEXT WITHOUT ANY ANALYTICAL OR EDITORIAL COMMENT. STATEMENTS OR THEORIES PREPARED BY: ADVOCATEDOR IMPLIED ARE THOSE OF THE SOURCE AND DO NOT NECESSARILY REFLECT THE POSITION TRANSLATION DIVISION OR OPINION OF THE FOREIGN TECHNOLOGY DI- FOREIGN TECHNOLOGY DIVISION VISION. WP.AFB, OHIO Date 21 Jan ;',wmf, D,-M,,, t -rma "....

4 U. S.* BOARD ON GEOGRAPHIC NAMES TRANSLITMATION SYSTEN Block Italic Transliteration Block Italic Transliteration AA A A i A, a Pp P p R r. 1 BB e V,v T 7? m T t rr ra G Y Y y Y U"u ad Dod **ft Fs X Zh, zh UUTjt 3a 35 Z.,z Chq ch Mx MIi W L11 Sh h Y.- Yy III im XIN Shcho shch K Xxk Ks 'b b 1 Ji a LY 1M i Yy MM M N M.,mbb b HI H" N, n 339E, e ,0 10 a O Yu, yu fl n H7 P.,p AN X N Ya..ya * ~initially, after vowels, and after %Ib,; e elsewhere. Wen written as t in Russian, transliterate 'is yt or LA. The use of diacritical marks is preferred, but such marks. may be omitted when expediency dictates. FTD-14T--VI i

5 THE VISCOSITY OF ISOBUTANE AT HIGH PRESSURES N. A. Agayev and A. D. Yusibova In literature there is a series of works devoted to the study of the viscosity of liquid and gaseous isobutane [3-7]. The comparison of experimental findings given in these works showed that they differed from one another substantially, therefore a study was made of the viscosity of liquid and gaseous isobutane (including the line of saturation and the area close to the critical point) in the interval of pressures from 1 to 700 kg/cm 2 and temperatures of C. Unlike the procedure applied earlier [l] in this investigation liquid thermostatic control was used [8]. The temperature of the experiment was measured by a model resistance thermometer to within 0.020C, pressure was measured by manometers of the type MP-60 and PM-600, class The timing of escape was conducted automatically with a P-30 electric timer to within 0.1 s. The main unit of the installation - a capillary viscometer - was made from "Supromaks" brand glass and it had the following geometric dimensions: diameter of capillary d H = cm, length of capillary IH = cm, volume of the measuring balloon V H = cm 3, 3 the drop in the level of mercury in the viscometer AH H = cm Chromatographic analy.is of the substance investigated by us showed that it contained 99.87% isobutane, 0.005% propane, and 0.08% n-butane. FTD-MT

6 Experiments were conducted based on isotherms with the temperature interval after every 10-Z50, and in the area close to the critical point after The step of pressure measurement in the beginning cf every 2 2 isotherm comprised 5-10 kg/cm, at a pressure above 100 kg/cm the step was changed after every kg/cm 2. In the area close to the critical point pressure on isotherms was changed with a step of kg/cm The viscosity of isobutane was measured on the following *isotherms: 0, 10, 25, 50, 75, 100, , 125, 130, 132.6, , 137, 1I0, 150, 175, 200, 225, 250, and 275. Here the limit of pressure measurement comprised kg/cm. For the determination of the viscosity of liquid isobutane on the line of saturation and in the area close to the critical point measurements were made at pressures up to 50 kg/cm 2 on isotherms 131.2, 132.6, 133.3, 134.0, 134.5, and At the assigned temperature and pressure the measurements were' made at each point 2-3 times; here tbh reproducibility of the experiments did not exceed 0.2%. A control measurement was conducted on the isobar 50 kg/cm 2. The isobar data coincided with measurements on the isotherms with an accuracy of 0.2-3%. The adjusted values of the viscosity coefficients of isobutane are given in Tables 1-3. The possible error of the experimental findings is estimated at ±1%. The diagram depicts the dependence of the excess viscosity (np,tnt) of isobutane on the density p for the limits of temperatures and pressures indicated in Tables 1-3. The values of density ha',e been taken from works [9-10). Values (np,t-nt) at all temperatures and pressures are arranged in one general curve; deviation does not *exceed ±1.0%. PTD-MT

7 Table 1. Viscosity of isobutane (adjusted values), 10-2 N's/im 4 4,. o.,.5..,,~t!,.,, I to 2$ I 7S" tool WI 125 M"'' W I is , t IMt J.2.24 I I.I f , D tO MSG M~ , ,358.M2] ISM7 f , M52 M.59 IJt ,.*6 J.27tl t % t t t , t I , t J.A , ,558 1.S t9.23 I N 5., t t ,.578&350 7, , , ) , A , O Z591 2, IO , , M , , t , , , , , , , H.03 t , W i S M M I , , , t W , ,321, , V 15,8l ,5.11, ,520 KEY: (1) Temperature, 0C; p, kg/cm 2 Table 2. Viscosity of isobutane (adjusted values) 30-5 N's/m 2. (2) I (1) T. aw.c t , & ,, % ,130 3,003 & ,9% ) , = 4, , ,20P, M, , , , S V0 5 5,200 5, o , KEY: (1) Temperature, 0; (2) p, kg/cm2 FTD-MT

8 Table 3. Viscosity of isobutane on the line of saturation (adjusted values) 10O5 N-s/m 3. f I -MkA 0 M8 t i00 p ,724P & ) SAN5 I2.g*) M0 t0.*8) ,0 5s') 0, ION g0 M679 7AD) I1 to wit1') I , e% M *-* x-izto-- KEY: (1) (liquid); (2) (gas)s (3)-p, kg/cm 2 C-M " _P KEY: (1) s/rni (2) saturation line; (2. (3) g/cm. V 94f * PS 45 Data found in the literature for the gaseous state at atmospheric pressure [1] and data given in work (3) for liquid isobutane on the saturation line are respectively 2 and 9% higher than that obtained by us. It should be noted that the ccmparative analysis of the data on the viscosity of liquid saturated hydrocarbons of a normal series and their isomers at atmospheric pre~sure showed that th viscosity * of isomers as a rule ic less. And only the data given in work (3] *FTD-MT

9 are an exception. The latter gives grounds to doubt their reliability. The comparison of data on the viscosity of isobutane at increased * temperatures and pressures shows that the data of the authors of work (6] are 8% lower than ours. The divergences of our data and data of work [7] on all isotherms do not exceed 2.5%. The sufficiently satisfactory coincidence of our data with the data of work [7], obtained by the capillary method, and the large divergence with the data obtained by the method of the rolled ball [6], again confirms the inadequacy of the method of the rolled ball, which was already indicated earlier [1, 11]. BIBLIOGRAPHY (IIoi o y eu aif. 0D., A r %e 11I. A. Davocitb aeebux yr.1eeoo.puo.u. I1aa. 4A~opuemp#, 11L I P k In M. It.. D) a v Iit so n J. A., 11T I t 4 r- I T. Bull. Chiem. Soc. Japan, v. 5, N 3. 09:11) h I da I. Phys. Rev. v. 21, jsagii 0i.11., S ale W. D.. Lacey W. N. Ind. Eng. Chem.. Ind. Ed., v. 31, N Gonzalez N Lee A. L. I of chemical 1,anti engineering. date., v. 11, N ). 81Areas It. A.. I~ e G a a A. A. etcn-1n31'eprethao. N' 9, Sa ae U. It., L a cc y W. It. Ind. Eng. Chain., Ind. Ed., v N OU32aaO-znIuMqKeC11 CIORCIRe HiLuy.tiKAA UZ Yr-IciOAOPO~tos. 1'1TII U4yaRIoII x ropilowuanitok. 191p? 7. [siiiroxys cc It. (1) oci. raan xi raaotux CiieteQ. OuaiiaMn,3, (Azerbaydzhan Scientific-Research Institute of Power Engineering imeni 1. G. Yes'mana [AzNII]). FTD-MT